blob: 6526e6f21ecfb22f23a5b19efb5b9d82287cef49 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Super block/filesystem wide operations
3 *
4 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
5 * Michael Callahan <callahan@maths.ox.ac.uk>
6 *
7 * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
8 * Copyright (C) Carnegie Mellon University
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/string.h>
15#include <linux/stat.h>
16#include <linux/errno.h>
17#include <linux/unistd.h>
18#include <linux/smp_lock.h>
19#include <linux/file.h>
20#include <linux/vfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include <asm/system.h>
24#include <asm/uaccess.h>
25
26#include <linux/fs.h>
27#include <linux/vmalloc.h>
28
29#include <linux/coda.h>
30#include <linux/coda_linux.h>
31#include <linux/coda_psdev.h>
32#include <linux/coda_fs_i.h>
33#include <linux/coda_cache.h>
34
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080035#include "coda_int.h"
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/* VFS super_block ops */
Al Virob57922d2010-06-07 14:34:48 -040038static void coda_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039static void coda_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070040static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Christoph Lametere18b8902006-12-06 20:33:20 -080042static struct kmem_cache * coda_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44static struct inode *coda_alloc_inode(struct super_block *sb)
45{
46 struct coda_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080047 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if (!ei)
49 return NULL;
50 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
51 ei->c_flags = 0;
52 ei->c_uid = 0;
53 ei->c_cached_perm = 0;
54 return &ei->vfs_inode;
55}
56
57static void coda_destroy_inode(struct inode *inode)
58{
59 kmem_cache_free(coda_inode_cachep, ITOC(inode));
60}
61
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070062static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
65
Christoph Lametera35afb82007-05-16 22:10:57 -070066 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
Paul Mundt20c2df82007-07-20 10:11:58 +090068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069int coda_init_inodecache(void)
70{
71 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
72 sizeof(struct coda_inode_info),
Paul Jackson4b6a9312006-03-24 03:16:05 -080073 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +090074 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (coda_inode_cachep == NULL)
76 return -ENOMEM;
77 return 0;
78}
79
80void coda_destroy_inodecache(void)
81{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070082 kmem_cache_destroy(coda_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85static int coda_remount(struct super_block *sb, int *flags, char *data)
86{
Jan Harkesfac1f0e2007-07-19 01:48:44 -070087 *flags |= MS_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return 0;
89}
90
91/* exported operations */
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080092static const struct super_operations coda_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 .alloc_inode = coda_alloc_inode,
95 .destroy_inode = coda_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -040096 .evict_inode = coda_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 .put_super = coda_put_super,
98 .statfs = coda_statfs,
99 .remount_fs = coda_remount,
100};
101
102static int get_device_index(struct coda_mount_data *data)
103{
104 struct file *file;
105 struct inode *inode;
106 int idx;
107
108 if(data == NULL) {
109 printk("coda_read_super: Bad mount data\n");
110 return -1;
111 }
112
113 if(data->version != CODA_MOUNT_VERSION) {
114 printk("coda_read_super: Bad mount version\n");
115 return -1;
116 }
117
118 file = fget(data->fd);
119 inode = NULL;
120 if(file)
Josef Sipekd4176d32006-12-08 02:36:56 -0800121 inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 if(!inode || !S_ISCHR(inode->i_mode) ||
124 imajor(inode) != CODA_PSDEV_MAJOR) {
125 if(file)
126 fput(file);
127
128 printk("coda_read_super: Bad file\n");
129 return -1;
130 }
131
132 idx = iminor(inode);
133 fput(file);
134
135 if(idx < 0 || idx >= MAX_CODADEVS) {
136 printk("coda_read_super: Bad minor number\n");
137 return -1;
138 }
139
140 return idx;
141}
142
143static int coda_fill_super(struct super_block *sb, void *data, int silent)
144{
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700145 struct inode *root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 struct venus_comm *vc = NULL;
147 struct CodaFid fid;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700148 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 int idx;
150
151 idx = get_device_index((struct coda_mount_data *) data);
152
153 /* Ignore errors in data, for backward compatibility */
154 if(idx == -1)
155 idx = 0;
156
157 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
158
159 vc = &coda_comms[idx];
160 if (!vc->vc_inuse) {
161 printk("coda_read_super: No pseudo device\n");
162 return -EINVAL;
163 }
164
165 if ( vc->vc_sb ) {
166 printk("coda_read_super: Device already mounted\n");
167 return -EBUSY;
168 }
169
Jens Axboe5163d902010-04-22 12:12:40 +0200170 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
171 if (error)
172 goto bdi_err;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 vc->vc_sb = sb;
175
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700176 sb->s_fs_info = vc;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700177 sb->s_flags |= MS_NOATIME;
178 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
179 sb->s_blocksize_bits = 12;
180 sb->s_magic = CODA_SUPER_MAGIC;
181 sb->s_op = &coda_super_operations;
Jens Axboe5163d902010-04-22 12:12:40 +0200182 sb->s_bdi = &vc->bdi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 /* get root fid from Venus: this needs the root inode */
185 error = venus_rootfid(sb, &fid);
186 if ( error ) {
187 printk("coda_read_super: coda_get_rootfid failed with %d\n",
188 error);
189 goto error;
190 }
191 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
192
193 /* make root inode */
194 error = coda_cnode_make(&root, &fid, sb);
195 if ( error || !root ) {
196 printk("Failure of coda_cnode_make for root: error %d\n", error);
197 goto error;
198 }
199
200 printk("coda_read_super: rootinode is %ld dev %s\n",
201 root->i_ino, root->i_sb->s_id);
202 sb->s_root = d_alloc_root(root);
203 if (!sb->s_root)
204 goto error;
205 return 0;
206
207 error:
Jens Axboe5163d902010-04-22 12:12:40 +0200208 bdi_destroy(&vc->bdi);
209 bdi_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 if (root)
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700211 iput(root);
212 if (vc)
213 vc->vc_sb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700215 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
218static void coda_put_super(struct super_block *sb)
219{
Jens Axboe5163d902010-04-22 12:12:40 +0200220 bdi_destroy(&coda_vcp(sb)->bdi);
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700221 coda_vcp(sb)->vc_sb = NULL;
222 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 printk("Coda: Bye bye.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
Al Virob57922d2010-06-07 14:34:48 -0400227static void coda_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Al Virob57922d2010-06-07 14:34:48 -0400229 truncate_inode_pages(&inode->i_data, 0);
230 end_writeback(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 coda_cache_clear_inode(inode);
232}
233
234int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
235{
236 int err = coda_revalidate_inode(dentry);
237 if (!err)
238 generic_fillattr(dentry->d_inode, stat);
239 return err;
240}
241
242int coda_setattr(struct dentry *de, struct iattr *iattr)
243{
244 struct inode *inode = de->d_inode;
245 struct coda_vattr vattr;
246 int error;
247
248 lock_kernel();
249
250 memset(&vattr, 0, sizeof(vattr));
251
252 inode->i_ctime = CURRENT_TIME_SEC;
253 coda_iattr_to_vattr(iattr, &vattr);
254 vattr.va_type = C_VNON; /* cannot set type */
255
256 /* Venus is responsible for truncating the container-file!!! */
257 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
258
259 if ( !error ) {
260 coda_vattr_to_iattr(inode, &vattr);
261 coda_cache_clear_inode(inode);
262 }
263
264 unlock_kernel();
265
266 return error;
267}
268
Arjan van de Ven754661f2007-02-12 00:55:38 -0800269const struct inode_operations coda_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 .permission = coda_permission,
271 .getattr = coda_getattr,
272 .setattr = coda_setattr,
273};
274
David Howells726c3342006-06-23 02:02:58 -0700275static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
277 int error;
278
279 lock_kernel();
280
David Howells726c3342006-06-23 02:02:58 -0700281 error = venus_statfs(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
283 unlock_kernel();
284
285 if (error) {
286 /* fake something like AFS does */
287 buf->f_blocks = 9000000;
288 buf->f_bfree = 9000000;
289 buf->f_bavail = 9000000;
290 buf->f_files = 9000000;
291 buf->f_ffree = 9000000;
292 }
293
294 /* and fill in the rest */
295 buf->f_type = CODA_SUPER_MAGIC;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700296 buf->f_bsize = 4096;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 buf->f_namelen = CODA_MAXNAMLEN;
298
299 return 0;
300}
301
302/* init_coda: used by filesystems.c to register coda */
303
David Howells454e2392006-06-23 02:02:57 -0700304static int coda_get_sb(struct file_system_type *fs_type,
305 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
David Howells454e2392006-06-23 02:02:57 -0700307 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
310struct file_system_type coda_fs_type = {
311 .owner = THIS_MODULE,
312 .name = "coda",
313 .get_sb = coda_get_sb,
314 .kill_sb = kill_anon_super,
315 .fs_flags = FS_BINARY_MOUNTDATA,
316};
317